JPH11215304A - Manufacture of drive component unit for image reader, drive component unit intermediate unit, the drive component unit for the image reader and the image reader provided the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing cost by facilitating the manufacture of the drive component unit provided with a light source and a light-receiving element in the case of configuring the image reader, where a light emitted from the light source is emitted to a linear area using a light guide member. SOLUTION: This manufacture method manufactures a drive component unit where a 1st board 3A and a 2nd board 3B are placed and the respective front sides are in crossing with each other, a light source 5 for lighting an original is mounted on the front side of the 1st board 3A, and an image reading light-receiving element 40 is mounted on the front side of the 2nd board 3B is provided with a process where the light-receiving element 40 and the light source 5 are mounted on a printed circuit board 3 with conductor wires 31A, 31B mounted thereon at least part of which are folded to be conductive to the light-receiving element 40 and the light source 5 respectively and a process where the printed circuit board 3 is separated into a 1st board 3A and the 2nd board 3B, without breaking the conductor wires 31A, 31B at a foldable position of the conductor wires 31A, 31B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for easily manufacturing a predetermined drive component unit of an image reading apparatus used for reading a document image by being incorporated in a facsimile apparatus or various scanner apparatuses.

[0002]

2. Description of the Related Art A schematic structure of an example of a conventional image reading apparatus is shown in FIG. This conventional image reading device,
It includes a light source 5e such as an LED lamp, a light guide member 1e (prism) made of a transparent member, and a plurality of light receiving elements 40e for receiving light reflected from the surface of the document K and performing photoelectric conversion. When the light emitted from the light source 5e enters the light guide member 1e from the end face 90 at the longitudinal end of the light guide member 1e, the light is reflected while being reflected by the plurality of side surfaces extending in the longitudinal direction of the light guide member 1e. While traveling in the longitudinal direction, the light is scattered and reflected at various portions of the light scattering / reflecting surface 91, so that the light is emitted to the outside of the light guide member 1 e from substantially the entire length area of the first side surface 92, and It is configured to be irradiated linearly. The light illuminated on the document K and reflected by the document K is thereafter received by the plurality of light receiving elements 40e, and an image signal having an output level corresponding to the amount of received light is output. .

As described above, the use of the light guide member 1e having the function of emitting the light emitted from the point-like light source 5e in a band shape or a linear shape makes it possible to minimize the number of the light sources 5e. Parts costs and running costs can be reduced. Further, since the light source 5e faces the end face 90 of the longitudinal end of the light guide member 1e, the traveling direction of the light emitted from the light source 5e becomes the longitudinal direction of the light guide member 1e, and the light is transmitted. It is convenient to proceed along the longitudinal direction of the light guide member 1e, and it is also possible to improve the efficiency of light emission from the first side surface 92 of the light guide member 1e.

On the other hand, conventionally, a drive component unit including drive components such as a light source 5e and a light receiving element 40e of the above image reading apparatus has been manufactured as follows. That is, in the related art, as is well shown in FIG. 19, the first substrate 94 on which the light source 5e is mounted and the second substrate 95 on which the light receiving element 40e is mounted are manufactured by separate operation steps. Later, these boards 94 and 95 were electrically connected to each other by soldering a plurality of wiring cords 96 to these two boards 94 and 95, for example. When the driving component unit is actually incorporated in the image reading apparatus, the first substrate 9
4, the light source 5e is connected to the end face 90 of the light guide member 1e.
Thus, the image reading apparatus is supported in an upright state by being supported by an appropriate portion such as a case of the image reading apparatus. Further, regarding the second substrate 95, the light receiving element 40
The image reading apparatus is mounted on a bottom surface of the case or the like of the image reading apparatus so as to be substantially horizontal so that e faces upward.

[0005]

However, in the above-described conventional method for manufacturing a drive component unit, the operation of mounting the light source 5e on the first substrate 94 and the light receiving element 40 on the second substrate 95 are not described.
Since the mounting operations of e are performed individually, not only does the work efficiency deteriorate, but also the operation of manufacturing a conductive wiring portion (not shown) on the surface of the first substrate 94 or the second substrate 95 is performed separately. The necessity arises, and the operation itself of manufacturing the two substrates 94 and 95 having the predetermined components 5e and 40e is complicated. Further, after manufacturing the first substrate 94 and the second substrate 95, it is necessary to perform an operation of aligning these substrates and connecting them via a plurality of wiring cords 96. Therefore, the first substrate 9
A series of operations from the manufacture of the fourth or second substrate 95 to the connection of the wiring cord 96 is very troublesome,
It has been difficult to perform these series of operations by mechanical operations. As a result, conventionally, the manufacturing efficiency of the drive component unit has been poor, the manufacturing cost has been high, and the manufacturing cost of the entire image reading apparatus has also increased.

[0006] The present invention has been devised in view of such circumstances, and is intended to be applied to a case in which light emitted from a light source can be irradiated to a linear region using a light guide member. It is an object of the present invention to make it easy to manufacture a drive component unit including a light source and a light receiving element, and to reduce the manufacturing cost.

[0007]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention employs the following technical means.

According to a first aspect of the present invention, there is provided a method of manufacturing a driving component unit for an image reading device.
The method for manufacturing a drive component unit for an image reading device includes a first substrate and a second substrate each having a surface set to cross each other, and the surface of the first substrate has a surface for document illumination. A method for manufacturing a driving component unit for an image reading device in which a light source is mounted and a light receiving element for image reading is mounted on the surface of the second substrate, the method comprising: Mounting the light receiving element and the light source on one circuit board on which at least a part of a conductive wiring portion that is at least partially foldable to conduct each other is formed; and And a step of dividing the circuit board into the first substrate and the second substrate without dividing the wiring portion.

In the invention of the present application, after mounting a light source and a light receiving element on one common circuit board, and dividing the circuit board to produce a first board and a second board, two boards are formed. As compared with the conventional work in which the light source and the light receiving element are individually mounted on the circuit board, the work of mounting the light source and the light receiving element on the circuit board can be performed efficiently, and the light source and the light receiving element can be electrically connected to the circuit board. The operation of forming the conductive wiring portion on the circuit board can be easily performed as a whole. Further, according to the present invention, when the circuit board is divided into the first substrate and the second substrate, the conductive wiring portion formed on the circuit board is not divided, so that the circuit board is divided after the division work. It is not necessary to perform an operation for wiring and connecting the first substrate and the second substrate to each other. Therefore, according to the present invention, a series of operations for manufacturing a drive component unit is significantly easier than in the past, and the operation of mounting a light source and a light receiving element on one circuit board is automated by mechanical operations. It is also possible to obtain the effect that the manufacturing efficiency of the drive component unit can be increased and the manufacturing cost can be significantly reduced.

Of course, according to the present invention, the circuit board is divided into a first substrate and a second substrate at a position where the conductive wiring portion can be bent.
After manufacturing the substrate, the first substrate and the second substrate can be set in a direction in which their respective surfaces cross each other by bending a part of the conductive wiring portion. Therefore, when this drive component unit is incorporated in the image reading apparatus, for example, the light emitted from this light source is opposed to the lateral end face of the light guide member while the light source of the first substrate is oriented sideways, while the second substrate is It is possible to appropriately set the light receiving element upward so as to receive light reflected from an image reading area located above the light receiving element.

According to a second aspect of the present invention, there is provided a method of manufacturing a drive component unit for an image reading apparatus.
This method is a method for manufacturing a driving component unit for an image reading device provided by the first aspect of the present invention, wherein a flexible slack portion is provided in advance on a conductive wiring portion of the circuit board, After the circuit substrate is divided into the first substrate and the second substrate, the slack portion of the conductive wiring portion is extended to displace the first substrate with respect to the second substrate.

In the present invention, in order to displace the first substrate with respect to the second substrate after dividing the circuit substrate into the first substrate and the second substrate, for example, the first substrate is placed on the side of the second substrate. Just standing in one side or above,
Even in the case where the light source mounted on the first substrate cannot appropriately face a predetermined position such as an end surface of a predetermined light guide member, the first substrate is moved relative to the second substrate. By displacing the positions, the light source can appropriately face the end surface of the light guide member. That is, since the light receiving element mounted on the second substrate receives the reflected light from the image reading area, generally, it is necessary to avoid that the light guide member is located above the light receiving element. In addition, it is necessary to offset the light guide member from a position above the light receiving element. In such a case, according to the present invention, it is possible to easily perform the alignment so that the light source mounted on the first substrate faces the light guide member existing at a position offset from the light receiving element. Thus, light can be efficiently projected onto the light guide member. Further, as another means for facing the light source to the light guide member present at a position offset from the light receiving element, a circuit board separated as the first substrate and the second substrate is formed wide, Means for preliminarily offsetting the light source mounted on the circuit board with respect to the light receiving element may be considered, but such means requires that the size of the circuit board be large. On the other hand, according to the present invention, the light source and the light receiving element mounted on the circuit board do not need to be largely offset from each other, so that the circuit board does not need to be formed wider than necessary. , The overall manufacturing cost can be further reduced. Further, according to the present invention, when the first substrate is displaced with respect to the second substrate in order to change the position of the first substrate by extending the slack portion of the conductive wiring portion, the conductive wiring portion is improperly cut. The risk of being performed can be appropriately eliminated.

According to a third aspect of the present invention, there is provided a drive component unit intermediate product for an image reading apparatus. This drive component unit intermediate product for an image reading apparatus has a first substrate and a second substrate whose respective surfaces are set to cross each other, and a light source for document illumination is provided on the surface of the first substrate. Is mounted, and is an intermediate product for manufacturing a driving component unit for an image reading device in which a light receiving element for image reading is mounted on the surface of the second substrate, wherein the light receiving element, the light source and And a circuit board on the surface of which is mounted.
Conductive wiring portions are provided for conducting the light receiving element and the light source, respectively, and the circuit board is connected to the first substrate between the mounting location of the light receiving element and the mounting location of the light source on the circuit board. A space for dividing the substrate, which can be separated from the second substrate, is provided, and the conductive wiring portion includes:
When the circuit board is cut in the board cutting space, it is characterized in that it can be bent at the cut portion.

In the drive component unit intermediate product provided by the third aspect of the present invention, the circuit board of the drive component unit intermediate product is cut at a predetermined board cutting space to mount the first light source. A substrate and a second substrate on which the light receiving element is mounted can be manufactured. In addition, the first substrate and the second substrate are electrically connected to each other via a bendable conductive wiring portion. Therefore, the present invention is suitable for manufacturing a drive component unit having a predetermined structure intended by the present invention.

In a preferred embodiment of the present invention, the circuit board dividing space of the circuit board may be provided with a concave groove or a hole for facilitating the dividing of the circuit board. .

According to such a configuration, the portion of the circuit board where the concave groove or hole is provided becomes weaker than other portions, and the circuit board can be easily divided at this portion. Become. In addition, if the circuit board cutting operation is facilitated, it is possible to prevent a large force from acting on the conductive wiring portion when cutting the circuit board by that much, and the conductive wiring portion is unduly cut together with the circuit board. It can be prevented from being done. Therefore, the yield at the time of manufacturing the drive component unit can be improved.

In another preferred embodiment of the present invention,
A portion of the conductive wiring portion that straddles the formation portion of the concave groove or the hole portion is formed of a bendable metal plate, a metal wire, a wiring cord, a flat cable, a flexible cable, or a conductive film. can do.

According to such a configuration, when the circuit board is divided at the location where the concave groove or the hole is formed, the first substrate and the second substrate obtained by the dividing operation are made of a bendable metal plate, A structure in which they are electrically connected to each other via a metal wire, a wiring cord, or a conductive film is obtained. Therefore, by bending the metal plate, metal wire, wiring cord, or conductive film,
The first substrate and the second substrate can be easily set so that their surfaces cross each other.

In another preferred embodiment of the present invention,
A portion of the conductive wiring portion that straddles the location where the concave groove or hole is formed is formed of a flexible conductive member such as a metal wire or a wiring cord, and a longitudinal middle portion of the conductive member. May be provided with a slack portion.

According to such a configuration, when the circuit board is divided at the location where the concave groove or the hole is formed, the first substrate and the second substrate obtained by the division work have a flexible portion having a bent portion. It is a structure that is conductively connected to each other via a conductive member having a characteristic. Therefore, by bending the conductive member, the first substrate and the second substrate can be easily set so that their surfaces intersect each other, and the slack portion of the conductive wiring portion can be extended. Thus, the first substrate can be easily arranged at a position shifted from the second substrate.

According to a fourth aspect of the present invention, there is provided a driving component unit for an image reading apparatus. This drive component unit for an image reading device is characterized by being manufactured by the method for manufacturing a drive component unit for an image reading device provided by the first aspect or the second aspect of the present invention.

According to a fifth aspect of the present invention, there is provided an image reading apparatus. The image reading apparatus includes a driving component unit for an image reading apparatus provided by the fourth aspect of the present invention, a light guide member having a plurality of side faces extending in the main scanning direction, and a condenser lens. And
The light guide member is configured to cause the light emitted from the light source of the drive component unit to enter the light guide member in the longitudinal direction of the light guide member while the first light guide member of the plurality of side surfaces of the light guide member. The light guide member is formed so as to be emitted to the outside of the light guide member from a predetermined length region of the side surface, and the light emitted from the first side surface of the light guide member is configured to irradiate a predetermined image reading region. It is characterized in that the light reflected from the image reading area is converged by the condenser lens and then received by the light receiving element of the drive component unit.

According to the fourth and fifth aspects of the present invention, effects similar to those obtained by the first or second aspect of the present invention can be expected.

The features and advantages of the present invention will become more apparent from the following description of embodiments.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1A is a perspective view showing an example of a drive component unit intermediate product U 'to which the present invention is applied, and FIG. 1B is a view showing the drive component unit intermediate product U' manufactured. FIG. 2 is a perspective view showing an example of a driving component unit U.
FIG. 2 is an enlarged sectional view of a main part of FIG.

A drive part unit intermediate product U ′ shown in FIG. 1A has a plurality of sensor ICs on the surface of one circuit board 3.
Chip 4, LED light source 5, and two metal plates 30, 3
0 is surface-mounted.

The circuit board 3 is made of, for example, a synthetic resin such as an epoxy resin or a ceramic and has a rectangular shape in plan view having a certain thickness. On the back surface of the area near the one end portion 3a in the longitudinal direction of the circuit board 3, a substantially reverse V cross section is taken along the width direction (transverse direction) of the circuit board 3.
The groove-shaped dividing grooves 32 are provided in series. The dividing groove 32 for dividing is for facilitating the dividing operation of the circuit board 3. In the present embodiment, the concave groove 32 between the LED light source 5 and the sensor IC chip 4 is provided. The space region corresponding to the space corresponds to the substrate cutting space referred to in the present invention.

In the present invention, the means for facilitating the division of the circuit board 3 includes, for example, means for providing a hole in the circuit board 3 instead of the means for providing the concave groove 32 in the circuit board 3. May be adopted. When the holes are provided, for example, a plurality of holes penetrating in the thickness direction of the circuit board 3 are provided in a perforated manner at appropriate intervals in the width direction of the circuit board 3, or the shape of the holes is changed. The circuit board 3 may be formed in a slender slit shape extending in the width direction, and the slit-shaped hole may be provided only at one place or at a plurality of places.

Each of the plurality of sensor IC chips 4 is a semiconductor chip in which a plurality of light receiving elements 40 are integrally formed on the surface thereof. It outputs a signal (image signal) having a corresponding output level. The plurality of sensor IC chips 4 are arranged in a row extending in the longitudinal direction of the circuit board 3 in a region of the surface of the circuit board 3 on the intermediate side of the concave groove 32 in the longitudinal direction of the circuit board 3. Are arranged.

The LED light source 5 is a light source for reading a monochrome image, which is a resin package of an LED chip that emits monochromatic light of white color or a color different from that. More specifically, as shown in FIGS. 3 and 4, for example, the LED light source 5 is formed by resin-packaging an LED chip 50 with a packaging resin 52, and
A part of each of the first lead 51a to which the D chip 50 is bonded and the second lead 51b connected and connected to the LED chip 50 via the wire W is used as the surface mounting electrodes 53, 53, and the packaging resin 52 is used. It is arranged on the bottom part of. The above packaging resin 5
A light-transmitting window 54 for irradiating the light emitted from the LED chip 50 to the outside is provided on the upper surface of the light emitting device 2. The light transmitting window 54 is filled with, for example, a transparent epoxy resin 55 to protect the LED chip 50 and the like. When the light source is capable of reading a color image, for example, instead of the LED chip 50, three types of LED chips that emit light of each color of R, G, and B (red, green, and blue) are used. The provided LED light source may be used.

As shown in FIG. 1, the LED light source 5
Is mounted on the surface of one end 3a in the longitudinal direction of the circuit board 3, and the LED light source 5 and the plurality of sensors I
The C chip 4 is located on the left and right sides of the dividing groove 32. The center position of the LED light source 5 in the width direction of the circuit board 3 is offset from the center of the plurality of sensor IC chips 4 by an appropriate dimension L.

On the surface of the circuit board 3, a first conductive wiring portion 31A that is connected to the LED light source 5 and a second conductive wiring portion 31B that is connected to the plurality of sensor IC chips 4 are provided. . Each of the first conductive wiring portion 31A and the second conductive wiring portion 31B is formed by patterning using a copper foil or the like, but a part of the first conductive wiring portion 31A has Each metal plate 30 is provided. More specifically, as is well shown in FIG. 2, a part of the first conductive wiring portion 31A is continuously provided so as to straddle an upper portion of a portion where the dividing groove 32 is formed. Or is provided so as to be discontinuous in the upper portion of the dividing groove 32, but on the upper surface portion of the first conductive wiring portion 21 </ b> A so as to straddle the formation position of the concave groove 32. The metal plate 30 is placed on the
The both ends in the longitudinal direction are electrically connected to the first conductive wiring portion 31A via the solder 80. The metal plate 30
For example, a thin nickel plate or aluminum plate, which is relatively easy to bend and deform, is applied.

The drive part unit intermediate product U 'is formed by applying a solder paste to a predetermined position on the surface of the circuit board 3 on which the copper foil patterns forming the conductive wiring portions 31A and 31B are formed by using a printing machine. Each of the plurality of sensor IC chips 4, the LED light source 5, and the two metal plates 30, 30 is mounted on the surface of the circuit board 3 using a chip mounter or the like, and thereafter, the circuit board 3 on which the components are mounted. Can be manufactured by carrying into a solder reflow furnace and reflowing the solder paste. Therefore, a series of working steps of the drive part unit intermediate product U ′ can be all performed by mechanical work, and the manufacturing work can be automated.

Next, a process of manufacturing the drive component unit U shown in FIG. 1B from the drive component unit intermediate product U 'having the above structure will be described.

First, in FIG. 1 (a), one end 3a in the longitudinal direction of the circuit board 3 of the intermediate part U 'of the driving part unit is shown.
An upward force F is applied to. As a result, the circuit board 3 can be divided into two substrates along the dividing groove 32. As shown in FIG.
And a plurality of sensor IC chips 4
And the second substrate 3B on which is mounted. Also,
When the circuit board 3 is divided in this way, the two metal plates 30, 30 are bent into a substantially L-shape in side view by the force F, and the first board 3A is set in a vertically upright posture. . Next, a connector 39 for electric wiring is mounted on the second substrate 3. In this case, the first conductive wiring portion 31A and the second conductive wiring 31B can be collectively and electrically connected to the one connector 39. The drive component unit U is manufactured by such a series of operation steps. As described above, the drive component unit U can be manufactured by simply performing the process of dividing the drive component unit intermediate product U ′ manufactured by mechanical work along the concave groove 32 and the process of attaching the connector 39. And the manufacturing operation becomes very easy.

In the drive component unit U, the LED light source 5 has the first conductive wiring portion 31A including the metal plates 30, 30.
And the sensor IC chips 4 are electrically connected to the connector 39 via the second conductive wiring portion 31B. Therefore, the connector 39
By connecting a predetermined signal line or power supply wiring to the LED, the LED light source 5 and the sensor IC chip 4 can be driven and necessary signals can be input and output. In addition, in order to maintain a predetermined bent shape, the two metal plates 30 and 30 have their surfaces substantially orthogonal to each other without using any special auxiliary means. It is also possible to maintain the posture of the user.

FIG. 5 is a partially omitted cross-sectional view showing an example of an image reading apparatus A having the above-mentioned drive component unit U. FIG. 6 is a sectional view taken along line VI-VI of FIG. FIG. 7 shows FIG.
FIG. 7 is a sectional view taken along line VII-VII of FIG. FIG. 8 is an exploded perspective view of the image reading device A shown in FIG.

The image reading apparatus A is configured as a contact type image sensor. As shown in FIG. 8, the image reading apparatus A includes the drive component unit U, a case 2, a light guide member 1, a condenser lens 6, and a first light reflection member. 7A, a second light reflecting member 7B, a transparent plate 20, and one or a plurality of attachments 27.

The case 2 is made of, for example, a synthetic resin, and is formed in an elongated box shape having an opening at substantially the entire upper surface and an opening at the bottom as appropriate.
The main components of the image reading apparatus A described above are accommodated in the case 2. The transparent plate 20 serves as a document guide plate for arranging a document to be read in an opposed manner, and is made of, for example, glass or synthetic resin. The transparent plate 20 is attached to the case 2 so as to close the upper opening of the case 2, and a position immediately above the condenser lens 6 on the upper surface of the transparent plate 20 is an image reading area S. (See FIG. 6). The image reading area S is a linear area extending in the main scanning direction. For example, a platen roller 98 is disposed on the upper surface of the transparent plate 20, and the document K is transported in the sub-scanning direction by the platen roller 98.

The second substrate 3B of the drive component unit U
Is positioned so that the light receiving elements 40 of the plurality of sensor IC chips 4 on the surface thereof are located below the condenser lens 6 and is mounted on the bottom of the case 2 in a substantially horizontal posture. I have. The condensing lens 6 is for converging the reflected light from the document K onto each of the light receiving elements 40. For example, a large number of Selfoc lenses capable of converging the document image to an erect equal size are used in the main scanning direction. Are applied. Of course, a lens array in which convex lenses are arranged in series may be used instead. Means for mounting the second substrate 3B on the bottom of the case 2 include:
For example, means for holding the bottom surface of the second substrate 3B by an attachment 27 engaged with engagement projections 28 provided on both right and left sides of the case 2 is employed. The attachment 27 is formed by, for example, pressing a thin metal plate, and exhibits an appropriate elasticity.

The first substrate 3A of the drive component unit U
As shown in FIG. 5, is provided in a posture standing upright in a space area at one longitudinal end in the case 2. LED light source 5 mounted on the first substrate 3A
Is disposed facing an end face 10E as a lateral face of one end in the longitudinal direction of the light guide member 1. The first substrate 3A includes:
As described above, the second board 3B is connected to the second board 3B via the metal plate 30. The upright posture can be held by the support of the metal plate 30, but the posture and the mounting position of the first board 3A are surely secured. As means for achieving the above, case 2
A means such as a concave portion into which a part of the first substrate 3A can be fitted or a convex portion (not shown) for supporting the first substrate 3A is provided as appropriate.

FIG. 9 is a schematic perspective view, partially in section, showing the light guide member 1. FIG. 10 is a sectional view taken along line XX of FIG. FIG. 11 is an explanatory diagram illustrating the operation of the light guide member 1.

The light guide member 1 is for efficiently irradiating the light emitted from the LED light source 5 of the drive component unit U to the entire length in the longitudinal direction of the linear image reading area S. As shown in FIG. 9, the light guide member 1 includes a transparent member 10 obtained by molding an acrylic transparent resin such as PMMA. It is a mirror surface. If the surface of the transparent member is made to be a mirror surface, when light travels inside the transparent member, light rays incident on the surface of the transparent member at an angle larger than the total reflection critical angle specified by the material of the transparent member Can be totally reflected, and light rays incident at an angle smaller than the critical angle for total reflection can be transmitted to the outside. The mirror surface is not necessarily required to be positively polished on the surface. For example, when a transparent member is resin-molded using a mold, it is a relatively smooth surface obtained by resin molding. Is also good.

The light guide member 1 can be divided into an auxiliary region Sb as one end in the longitudinal direction of the light guide member 1 and a main region Sa other than the auxiliary region Sb. The auxiliary area Sb
Is a part that plays a role of advancing light emitted from the LED light source 5 to the end face 10E into the main area Sa.
The main area Sa is formed in an appropriate block shape, and the portion near the main area Sa is gradually formed into a cross-sectional shape of the main area Sa so as to minimize a portion where the shape changes rapidly between the auxiliary area Sb and the main area Sa. It has a shape approaching.

The main region Sa has a uniform cross-sectional shape at various points in the longitudinal direction, and the first side surface 10 extends in a certain direction.
A, second side 10B, third side 10C, fourth side 10
D, and an end face 10F at the other end in the longitudinal direction.
The first side face 10A and the second side face 10B face each other, and the third side face 10C and the fourth side face 10D face each other.

The first side surface 10A has a substantially full length region in the longitudinal direction serving as a light emitting surface for emitting light, and its central portion in the width direction bulges more than its side edge in the width direction. Aspherical convex surface. The third side surface 10C
As shown in FIG. 11, the parabolic surface (quadratic surface) having the center axis C in the width direction between the third side surface 10C and the fourth side surface 10D as a common principal axis. ). Note that the center line C is inclined with respect to the vertical direction.
This is for irradiating the image reading area S with light emitted from the side surface 10 as it is.

As shown in FIG. 11, the second side surface 10B serves as a surface passing through the common focal point O1 of the respective paraboloids of the third side surface 10C and the fourth side surface 10D or the vicinity thereof. Is formed. As well shown in FIG. 10, a plurality of groove-shaped concave portions 14 are provided on the second side surface 10B at appropriate intervals. A region between the plurality of recesses 14 is a mirror-like flat portion 13.
It has been. The plurality of recesses 14 are formed by rapidly changing a traveling angle of light traveling in the light guide member 1,
This portion serves to emit the light from the first side surface 10A, and has, for example, an arc-shaped cross section. As another means for rapidly changing the traveling angle of light, the second means is used.
Means for providing a plurality of protrusions on the side surface 10B at appropriate intervals, means for applying a material capable of scattering and reflecting light to the second side surface 10B, means for forming the second side surface 10B with a rough surface having minute irregularities, and the like. Can be adopted.

The light guide member 1 emits light that has entered the inside from the end face 10E from the substantially entire length of the first side face 10A. Specifically, as shown in FIG.
When light emitted laterally from the light guide member 1 with an appropriate spread angle enters the light guide member 1 from the end face 10E, the light travels into the main region Sa. Then, the light is the first
Side 10A, third side 10C, and fourth side 10D
And reaches the end face 10F at the other end in the longitudinal direction of the light guide member 1 while repeating total reflection at the various places and the flat portion 13 of the second side face 10B. When light is incident on the second side surface 10B, most of the light incident on each concave portion 14 is reflected in a form close to scattered reflection, and the course of the light is rapidly changed. For this reason, most of the light that has reached the second side surface 10B travels toward the third side surface 10C and the fourth side surface 10D, as shown in FIG. Is reflected. However, since the third side surface 10C and the fourth side surface 10D are paraboloids, and the second side surface 10B is located near the focal point O1 of the paraboloid, the third side surface 10C and the fourth side surface 10D are parabolic. 4
Many light beams reflected by the side surface 10D become a light beam bundle substantially parallel to the principal axis of the paraboloid, and the first side surface 10A
And exits from various parts of the first side surface 10A in substantially the entire length region to the outside. At this time, the first side surface 10A
The light beam is focused on the focal point O2 by the action of the convex surface.

As best shown in FIG. 6, the light guide member 1 is housed in the case 2 so as to be located on one side of the condenser lens 6, and the first side surface 10A of the case 2 It is positioned so as to face the image reading area S. In addition, since the LED light source 5 of the drive component unit U is previously mounted at a position offset by a predetermined dimension L in the width direction of the first substrate 3A and the second substrate 3B with respect to the plurality of sensor IC chips 4, Even when the light guide member 1 is arranged on one side of the condenser lens 6, the LED light source 5 is appropriately positioned with respect to the end face 10E of the light guide member 1 as well shown in FIG. Can be arranged facing each other.

The first light reflecting member 7A is a member that functions as a holder for the light guide member 1. More specifically, the first light reflecting member 7A has a groove 70 having a substantially V-shaped cross section with an open front surface, as best seen in FIGS. The member 1 is held by the first light reflecting member 7A by fitting the main area Sa into the groove 70. The light guide member 1 is disposed above the second substrate 3B by incorporating the first light reflection member 7A into the case 2.
As the inner wall surfaces of the groove 70, there are inner wall surfaces 70b, 70c, and 70d facing the second side surface 10B, the third side surface 10C, and the fourth side surface 10D of the light guide member 1, respectively. Is the side surface 1 of the light guide member 1
It prevents leakage through the OB through 10D.
The first light reflecting member 7A is made of a white synthetic resin having a high light reflectance of about 97% or 98% on the surface thereof, for example.

As shown in FIG. 5, an end face 1 of the light guide member 1 is provided at one end of the groove 70 in the longitudinal direction.
A planar side surface portion 70e opposing 0F is provided. Therefore, when light traveling inside the light guide member 1 reaches the end face 10F, the light is transmitted to the side face 70e.
Is reliably reflected by the end face 10F.
Light is also prevented from leaking to the outside. As means for preventing light from leaking from the end face 10F of the light guide member 1 to the outside, instead of means using the first light reflecting member 7A, for example, aluminum, chrome, or the like is provided on the end face 10F. For example, means for depositing a metal or other light reflecting material can be employed.

The second light reflecting member 7B includes the light guide member 1
And a member for preventing light from leaking out of the auxiliary region Sb. This second
The light reflecting member 7B has a cylindrical shape, for example, and is fitted to the auxiliary region Sb so as to be fitted outside.
It surrounds the outer surface except for E. This second light reflecting member 7
B is also made of a white synthetic resin having a high light reflectance similarly to the first light reflection member 7A.

In the image reading device A, the reading operation of the original image can be appropriately performed. That is, as shown in FIG. 6, when the LED light source 5 is driven to emit light in a state where the document K is placed on the transparent plate 20, the light is guided from the end face 10E at one longitudinal end of the light guide member 1. The light enters the member 1. Then, as described above, the light is emitted from various portions of the substantially entire length area of the first side surface 10A while traveling to the other end portion side in the longitudinal direction of the light guide member 1, and the light is emitted to the document surface in the image reading area S. Irradiated linearly. In this case, the light emitted from the first side surface 10A does not disperse in various directions, is efficiently in the linear image reading area S, and is substantially evenly distributed in the longitudinal direction of the image reading area S. Irradiated. The light reflected by the document K is then focused by the condenser lens 6 and then received by the light receiving element 40 of the sensor IC chip 4.
An image signal having a level corresponding to the amount of received light is obtained.

In the above-described embodiment, since the first conductive wiring portion 31A of the drive component unit intermediate product U 'is partially formed by the metal plate 30, the circuit board 3 is divided. When the metal plate 30 is bent, the first substrate 3A can be held upright using the metal plate 30, but the present invention is not limited to this. In the present invention, in place of the metal plate 30, for example, other types of bendable metal plates, metal wires, wiring cords,
A flat cable, a flexible cable, a conductive film, or the like may be used. The flat cable is
A plurality of cables each having a conductor covered with a resin are bundled in a flat shape, and a flexible cable is formed by forming a wiring portion such as a copper foil on a thin flexible film such as polyimide. These members may be soldered to other portions of the first conductive wiring portion 31A,
Instead of such a means, for example, a wire such as a gold wire or an aluminum wire used for connection in the semiconductor manufacturing field is used as a metal wire, and this wire is used for the first conductive wiring portion using a wire bonder. It may be bonded at a predetermined position.

FIG. 12 is a perspective view showing another example of a drive component unit intermediate product Ua 'to which the present invention is applied. FIG. 13 is an enlarged sectional view of the main part. FIG. 14 is a perspective view showing an example of the drive component unit Ua manufactured from the drive component unit intermediate product Ua ′. FIG. 15 is a cross-sectional view illustrating an example of the image reading device Aa configured by incorporating the drive component unit Ua. FIG.
In the following drawings, the same parts as those in the previous embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Driving part unit intermediate product U shown in FIG.
a ′ has a structure substantially the same as that of the drive component unit intermediate product U ′ described above, but the first conductive wiring portion 3
1A, instead of the above-mentioned metal plates 30, 30, there are provided metal wires having relatively flexibility and flexibility, or conductive members 35, 35 of a wiring cord type coated with the metal wires. As shown in FIG. 13, both ends 35a of the respective conductive members 35 are formed so as to straddle the portions where the concave grooves 32 for division are formed on the circuit board 3 ′. Although the conductive portion is conductively bonded to the copper foil pattern of 31A, the middle portion thereof is formed as a loosened portion 35b which is bent upward with a margin without being bonded to the surface of the first conductive wiring portion 31A or the surface of the circuit board 3 '. Have been.

The intermediate part Ua 'of the drive component unit is formed by dividing the circuit board 3' at the position of the dividing groove 32, as shown in FIG.
The first substrate 3C and the second substrate 3D connected to each other via
It can be used to manufacture a drive component unit Ua having Further, the first substrate 3C is moved to the second substrate 3D by extending the slack portion 35b of the conductive member 35.
, And the LED light source 5 on the first substrate 3C can be largely offset from the plurality of sensor IC chips 4 on the second substrate 3D.

In this way, if the LED light source 5 and the plurality of sensor IC chips 4 are offset, as shown in FIG. 15, the plurality of sensor IC chips 4 are disposed immediately below the condenser lens 6. As well as LED
The light source 5 can appropriately face the end surface of the light guide member 1 arranged on the side of the condenser lens 6. Therefore, it is not necessary to offset the LED light source 5 and the plurality of sensor IC chips 4 by a large dimension on the circuit board 3 'in the manufacturing stage of the drive component unit intermediate product Ua'. It is not necessary to increase the width of the circuit board 3 'for the purpose of securing the offset dimension. As a result, the circuit board 3 ′
This is advantageous in reducing the width of the first substrate 3C and the size of the second substrate 3D incorporated in the image reading device Aa. In addition, if the size of the circuit board 3 'of the drive component unit intermediate product Ua' can be reduced, the raw material cost of the board can be reduced accordingly.

FIG. 16 is a cross-sectional view of a main part showing another example of the combined structure of the drive component unit Ub and the light guide member 1A to which the present invention is applied.

In the structure shown in the figure, the drive component unit Ub is composed of one second substrate 3B on which a plurality of sensor IC chips 4 are mounted, and metal plates 30 on both ends in the longitudinal direction of the second substrate 3B. And two first substrates 3A, 3A which are electrically connected to each other. The LED light source 5 is mounted on each of the two first substrates 3A, 3A. The light guide member 1A is formed in a symmetrical shape, and has end faces 10E, 1 at both ends in the longitudinal direction.
0E faces the LED light sources 5 and 5, respectively.
According to such a configuration, the two end faces 1 of the light guide member 1A are provided.
It is possible to make the light enter the light guide member 1A from 0E and 10E, and then make the light travel to the longitudinal middle part of the light guide member 1A and emit the light from the substantially entire length region of the first side surface 10A. Accordingly, the amount of light incident on the light guide member 1A can be easily increased, and the amount of light applied to the image reading area of the image reading device can be increased. As described above, in the present invention, the drive component unit may be provided with the two first substrates, and the specific number is not particularly limited.

A driving part unit intermediate product according to the present invention,
The specific configuration of the drive component unit and each part of the image reading apparatus, and the specific configuration of each operation step of the method of manufacturing the drive component unit according to the present invention are not limited to the above-described embodiment.

For example, in the present invention, it is not always necessary to form a concave groove or a hole for dividing in a board dividing space of a circuit board of a drive component unit intermediate product. If the circuit board is made of a material or thickness that is relatively easy to cut,
The first substrate and the second substrate can be manufactured by appropriately cutting the circuit board without unduly removing the conductive wiring portion. Therefore, the space for dividing the substrate referred to in the present invention may be a mere appropriate space provided between the light source and the light receiving element.

Further, according to the present invention, when the circuit board of the drive component unit intermediate product is divided, the division does not need to be performed at the place where the conductive wiring portion (first conductive wiring portion) conducting to the light source is formed. For example, the circuit board may be divided into a first substrate and a second substrate at a position where a conductive wiring portion (second conductive wiring portion) that is electrically connected to the light receiving element is formed. In the present invention, a specific cut portion of the circuit board is not limited.

Further, in the present invention, the specific structure of the light guide member constituting the image reading device is not limited to the above embodiment. In the present invention, as the light guide member,
For example, an elongated simple rectangular parallelepiped light guide member extending in a certain direction may be used. Even in the light guide member having such a configuration, the light is incident on the inside of the light guide member from the end face of the longitudinal direction end portion of the light guide member, so that the light is guided by the plurality of side surfaces extending in the longitudinal direction of the light guide member. While being reflected and traveling in the longitudinal direction of the light guide member, the light can be emitted to the outside from a fixed length region of the first side surface among the plurality of side surfaces. In addition, the light guide member is not limited to the one that allows light to enter from the end face in the longitudinal direction. For example, as shown in FIG. 17, the light guide member is provided at the longitudinal end of the light guide member 1A separately from the end face 10E. A tapered surface 16 having a width in the vertical thickness direction of 1A is formed.
Alternatively, the light source 5 may face the light source. A light-shielding layer 16a or a light-shielding member for preventing light transmission is provided on the side surface of the light guide member 1E facing the surface 16 as necessary. Even with such a configuration, after light enters the light guide member 1E from the surface 16, the light is transmitted to the light guide member 1E.
E can be advanced toward the middle part in the longitudinal direction. Further, the light guide member does not need to be provided so that light emitted from the first side surface is directly applied to the image reading region of the image reading device. For example, the light guide member emits light from the first side surface of the light guide member. The light may be provided so that the reflected light is reflected by a reflection mirror or a light reflection sheet, or is transmitted through the inside of another light guide member to irradiate the image reading area.

In the present invention, the type of light source is L
The light source is not limited to the LED light source in which the ED chip is resin-packaged, and another light source may be used. Further, the image reading apparatus according to the present invention can be configured as a contact-type image sensor used as a handy scanner, instead of being configured as a contact-type image sensor arranged to face the platen roller. A so-called flatbed type image sensor in which a circuit board on which a predetermined light source and a light receiving element are mounted and a case incorporating a light guide member are relatively movable in the sub-scanning direction with respect to a document placing plate for placing a document. It can also be configured as

[Brief description of the drawings]

FIG. 1A is a perspective view showing an example of a drive component unit intermediate product to which the present invention is applied, and FIG. 1B is an example of a drive component unit manufactured from the drive component unit intermediate product. FIG.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a cross-sectional view illustrating an example of a light source.

FIG. 4 is a perspective view schematically showing an internal structure of the light source shown in FIG.

FIG. 5 is a partially omitted cross-sectional view illustrating an example of an image reading apparatus including the drive component unit illustrated in FIG.

FIG. 6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 5;

8 is an exploded perspective view of the image reading device shown in FIG.

FIG. 9 is a schematic perspective view, partly in section, showing a light guide member used in the image reading apparatus shown in FIG.

FIG. 10 is a sectional view taken along line XX of FIG. 9;

FIG. 11 is an explanatory view showing an operation of the light guide member shown in FIG. 9;

FIG. 12 is a perspective view showing another example of a drive component unit intermediate product to which the present invention is applied.

FIG. 13 is an enlarged sectional view of a main part of the intermediate drive component unit shown in FIG. 12;

14 is a perspective view showing an example of a drive component unit manufactured from the intermediate product of the drive component unit shown in FIG.

FIG. 15 is a cross-sectional view illustrating an example of an image reading apparatus configured by incorporating the drive component unit illustrated in FIG.

FIG. 16 is a cross-sectional view of a main part showing another example of a combination structure of a driving component unit for an image reading apparatus and a light guide member to which the present invention is applied.

FIG. 17 is an explanatory view of a main part showing another example of the combination structure of the light guide member and the light source.

FIG. 18 is an explanatory diagram illustrating an example of a conventional image reading apparatus.

FIG. 19 is a perspective view showing an example of a drive component unit used in the conventional image reading apparatus shown in FIG.

[Explanation of symbols]

 1, 1A, 1E Light guide member 2 Case 3, 3 'Circuit board 3A, 3C First board 3B, 3D Second board 4 Sensor IC chip 5 LED light source 6 Condensing lens 7A First light reflecting member 7B Second Light reflecting member 10A First side surface 10E End surface 30 Metal plate 31A First conductive wiring portion 31B Second conductive wiring portion 35 Conductive member 35a Longitudinal end portion 35b Slack portion 40 Light receiving element S Image reading area A, Aa Image reading device U, Ua, Ub Drive component unit U ', Ua' drive component unit intermediate product

Claims (8)

[Claims] A first substrate and a second substrate, each surface of which is set to cross each other;
A method for manufacturing a driving component unit for an image reading device in which a light source for document illumination is mounted on the surface of the substrate and a light receiving element for image reading is mounted on the surface of the second substrate. A step of mounting the light receiving element and the light source on one circuit board on which at least a part of a bendable conductive wiring portion for conducting the light receiving element and the light source are formed, respectively, Separating the circuit board into the first substrate and the second substrate without splitting the conductive wiring portion at a position where the portion can be bent. Manufacturing method of drive parts unit. 2. The method of manufacturing a driving component unit for an image reading device according to claim 1, wherein the conductive wiring portion of the circuit board is provided with a slack portion having flexibility in advance, and A drive part for an image reading device, wherein after the first substrate and the second substrate are separated, a slack portion of the conductive wiring portion is extended to displace the first substrate with respect to the second substrate. Unit manufacturing method. 3. A semiconductor device comprising: a first substrate and a second substrate having respective surfaces set in directions intersecting with each other;
An intermediate product for manufacturing a drive component unit for an image reading device, in which a light source for document illumination is mounted on the surface of the substrate and a light receiving element for image reading is mounted on the surface of the second substrate. And a circuit board having the light receiving element and the light source mounted on the surface thereof, and the circuit board is provided with conductive wiring portions that respectively conduct to the light receiving element and the light source, and A space for separating the circuit board into a first substrate and a second substrate is provided between the mounting position of the light receiving element of the circuit board and the mounting position of the light source. An image reading device, wherein the conductive wiring portion is configured to be bendable at the cut portion when the circuit board is cut in the board cutting space. Drive components unit intermediate product. 4. The driving component for an image reading device according to claim 3, wherein a groove or a hole for facilitating the division of the circuit board is provided in the substrate dividing space of the circuit board. Unit intermediate product. 5. A portion of the conductive wiring portion that straddles the location where the concave groove or hole is formed is formed of a bendable metal plate, a metal wire, a wiring cord, a flat cable, a flexible cable, or a conductive film. The drive component unit intermediate product for an image reading device according to claim 4, wherein 6. A portion of the conductive wiring portion that straddles the location where the concave groove or hole is formed is formed of a flexible conductive material such as a metal wire or a wiring cord, and the conductive member is formed of a flexible material. 5. The intermediate product of the drive component unit for an image reading device according to claim 4, wherein a slack portion is provided at a middle portion in the longitudinal direction of the drive unit. 7. A driving component unit for an image reading device, which is manufactured by the method for manufacturing a driving component unit for an image reading device according to claim 1. 8. A drive component unit for an image reading apparatus according to claim 7, comprising: a light guide member having a plurality of side surfaces extending in a main scanning direction; and a condenser lens. The light member is configured such that light emitted from the light source of the driving component unit and incident on the light guide member travels in the longitudinal direction of the light guide member while maintaining a first side surface of the plurality of side surfaces of the light guide member constant. The light guide member is formed so as to be emitted from the length region to the outside of the light guide member, and the light emitted from the first side surface of the light guide member is configured to irradiate a predetermined image reading region, and the image is formed. An image reading apparatus, wherein light reflected from a reading area is converged by the condenser lens and then received by a light receiving element of the drive component unit.